[alanfalcon]

A plot point in Neal Stephenson's Anathem involves the specific wavelength of red light that is seen in a certain circumstance, which is similarly 'forbidden'. (Side note: Had to read Anathem multiple times to really get the novel, but it was worth the investment to me.)

[FredPret]

That man is a gem. Most of his books deserve multiple readings

[pavel_lishin]

> (Side note: Had to read Anathem multiple times to really get the novel, but it was worth the investment to me.)

Same here, and probably true of most readers.

[adastra22]

It's an essential plot point in Project Hail Mary as well.